U-shaped concrete superposed beam

Abstract

The invention discloses a U-shaped concrete superposed beam. The U-shaped concrete superposed beam comprises a concrete bottom plate, concrete side walls, inner formworks, tie bars, longitudinal load-bearing steel bars and stirrups. The concrete side walls are arranged on the two sides of the concrete bottom plate. The inner mold sheet is arranged on the inner side of the concrete side wall; the tie bars are anchored in the concrete side wall end to end and arranged in the length direction of the concrete side wall. The longitudinal load-bearing steel bars are embedded in the concrete bottom plate and sleeved with the stirrups. And the stirrup part is embedded in the concrete side wall or the concrete bottom plate. According to the device, one-time pouring forming of the U-shaped concrete composite beam is achieved through the inner formwork and the tie bars, manufacturing is convenient, the integrity of a prefabricated part is good, the later-period rigidity is large, and bonding of composite concrete and prefabricated concrete is better. The composite beam prefabricated part is lighter in weight, free of molds and supports and convenient to transport and install.

Description

Technical Field

[0001] The invention specifically relates to the field of engineering technology, in particular to a U-shaped concrete composite beam which can be widely used in beams of various projects. Background Art

[0002] The technical application of prefabricated composite beams is very extensive. At present, the most widely used in the market is the composite beam, which is characterized by a lot of precast concrete, which can save formwork and reduce support. However, due to the large cross-section, heavy concrete weight, low transportation and installation efficiency, the cost is higher than the existing cast-in-place structure. Many people also thought of using grooved composite beams, but due to the complex steel bars in the existing grooved composite beams, the high cost of the inner mold and the difficulty of production. The production requires two or three pourings of concrete, and the process is complicated. In addition, the rigidity and strength of prefabricated components are insufficient, and the support cannot be reduced during construction. The final project cost is high, so it is difficult to apply and promote.

[0003] A prefabricated U-shaped composite beam (patent number CN 207017528 U) proposes that U-shaped steel plates are wrapped with concrete to form U-shaped steel-concrete composite beams. This technology forms a stable stirrup by welding anchor bars with U-shaped steel plates and steel mesh plates in concrete. This technology can make the composite beam components light, easy to transport and install, and reduce transportation and installation costs. However, due to the use of anchor bars, steel plates and steel mesh plates for welding, the welding workload and energy consumption are very large, and its prefabrication cost will be very high. Its principle is to use concrete to wrap U-shaped steel plates to form U-shaped steel reinforced concrete composite beams. This technology also does not solve the problem of one-time casting of ribs and bottom plates. Increasing the strength and rigidity of the composite beam depends on U-shaped steel, which is costly and ineffective.

[0004] An assembled cast-in-place prefabricated integral reinforced concrete composite beam (patent number CN 203213396 U) proposes a U-shaped prefabricated composite beam, whose inner wall is a rough surface, and the cast-in-place T-shaped section forms a whole with the rough surface. Compared with the prefabricated assembled structure, this technology has greatly improved the integrity of the structure, and the seismic performance has been significantly enhanced; and the number of templates required to be erected during the structural construction process has been greatly reduced compared with the cast-in-place reinforced concrete structure, and the construction speed has been significantly accelerated, effectively shortening the project period. However, the production of prefabricated components of this technology is very complicated. Due to the complex relationship between the structural steel bars, longitudinal force steel bars and stirrups of the beam, it is difficult to realize the production of prefabricated components of this technology. Moreover, since the side walls and the bottom plate are relatively thin, the rigidity of the prefabricated components is relatively small, and the stability of the side walls themselves is also weak. Support and lateral tensioning measures are also required during on-site construction. Summary of the invention

[0005] To this end, the present invention proposes a U-shaped concrete composite beam to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention discloses a U-shaped concrete composite beam, which comprises: a concrete bottom plate, a concrete side wall, an inner mold, a tie bar, a longitudinal force-bearing steel bar and a stirrup. The concrete side wall is arranged on both sides of the concrete bottom plate; the inner mold is arranged on the inner side of the concrete side wall; the tie bar is anchored in the concrete side wall at both ends and arranged along the length direction of the concrete side wall; the longitudinal force-bearing steel bar is buried in the concrete bottom plate and is sleeved in the stirrup; the stirrup is partially buried in the concrete side wall or the concrete bottom plate.

[0007] Further, preferably, the inner mold piece is permanently placed on the inner side of the concrete side wall, with the bottom edge close to the lower surface of the concrete bottom plate.

[0008] Furthermore, preferably, the inner mold plate bottom plate is provided with a small notch, the small notch is slightly larger than the diameter of the stirrup, and the stirrup passes through the small notch.

[0009] Furthermore, preferably, the inner side of the concrete side wall is provided with vertical ribs.

[0010] Further, preferably, the inner mold piece has vertical ribs bent longitudinally, corresponding to the vertical ribs.

[0011] Further, preferably, an outer longitudinal rib is provided on the outer side of the top of the concrete side wall.

[0012] Further, preferably, an inner longitudinal rib is provided on the outer side of the top of the concrete side wall.

[0013] Further, preferably, the inner mold piece has longitudinally bent horizontal ribs corresponding to the inner longitudinal ribs. Furthermore, as a preference, waist longitudinal steel bars are provided in the concrete side walls, and the waist longitudinal steel bars are arranged vertically in the concrete side walls.

[0014] Furthermore, preferably, the waist longitudinal reinforcement is prestressed reinforcement.

[0015] Furthermore, as a preference, the waist longitudinal reinforcement is located outside the stirrups and is tied together with the stirrups and tension bars.

[0016] Furthermore, preferably, a post-tensioned prestressed pipe is provided between the concrete side wall and the concrete bottom plate.

[0017] Further, preferably, the post-tensioned prestressed pipe has a shape of a curve, a broken line or a straight line.

[0018] Furthermore, preferably, the longitudinal force-bearing steel bars are prestressed steel strands or non-prestressed steel bars or a combination of prestressed steel bars and non-prestressed steel bars.

[0019] Furthermore, preferably, the inner mold sheet is a steel mesh or a thin steel sheet with indentations.

[0020] Furthermore, preferably, steel bars are laid on the upper portion of the concrete base plate.

[0021] Further, preferably, the stirrups are welded closed stirrups.

[0022] Furthermore, preferably, the concrete base plate has a thickness of 40 to 300 mm.

[0023] The present invention adopts the above technology, and has the following beneficial effects compared with the existing technology: the concrete side wall is cast together with the bottom plate, and the manufacturing process is simple. The self-stable strength of the side wall is relatively large, which meets the strength requirements of the post-cast concrete. The rigidity and strength of the prefabricated components are relatively large, and support-free construction can be achieved. The prefabricated components are lighter in weight, and the integrity and seismic resistance of the structure are better. The construction and installation avoids steel bar conflicts, the hoisting weight is light, no support and formwork are required, the construction is simple, the efficiency is high, and the construction period is saved.

[0024] The inner mold is used, and the lower side of the inner mold is close to the bottom surface of the bottom plate, which can block the pressure difference between the side wall and the bottom plate when pouring concrete, and can complete the pouring in one time. At the same time, the inner mold is a permanent metal template, which can enhance the shear resistance of the prefabricated components and the bonding performance of the prefabricated components with the composite concrete. A small notch is opened at the bottom edge of the inner mold, and the stirrups pass through the small notch. During the production, the position of the stirrups can be fixed. When the components are poured, the pressure difference between the side wall concrete and the bottom plate concrete can also be blocked, so that the side wall concrete and the bottom plate concrete can be poured in one time.

[0025] The inner side of the concrete side wall is a vertical rib. The inner mold piece is bent to increase the rigidity of the inner mold piece to meet the requirements of side wall casting. At the same time, the overall thickness of the side wall can be made thinner, forming the effect of thin plate ribs, that is, the side wall is partially thickened and thinner in most places. Local thickening means that the beam template and the inner mold piece are widened in some places to facilitate the pouring of concrete during side wall casting. The inner side of the side wall is concave and convex, and the contact surface between the prefabricated component and the composite concrete is larger, which is more conducive to the overall performance of the component after superposition to be closer to cast-in-place.

[0026] The top of the concrete side wall is partially thickened outward to form a longitudinal rib protruding from the outside of the side wall. The upper edge of the prefabricated component is thickened to increase the bending inertia moment of the prefabricated component, thereby increasing the strength and rigidity of the component. The outward protruding part also facilitates the placement of the prefabricated composite slab, achieving complete formwork and support-free construction. The protruding side wall ribs can facilitate the pouring of concrete when the prefabricated component is formed.

[0027] The top of the concrete side wall is partially thickened inwards to protrude from the inner side of the side wall to form an inner longitudinal rib, and the upper edge of the precast component is thickened to increase the bending moment of inertia of the precast component, thereby increasing the strength and rigidity of the component. The protruding side wall ribs can facilitate the pouring of concrete when the precast component is formed.

[0028] The concrete side wall is provided with waist longitudinal steel bars, which are arranged vertically in the waist longitudinal steel bars concrete side wall. The longitudinal steel bars are prestressed steel bars, which can improve the crack resistance and torsional strength of prefabricated components and reduce the amount of steel used. The longitudinal steel bars are located on the outside of the stirrups and tied together with the stirrups and the tension bars, so that the two concrete side walls can form a whole through the intercepting bars, enhance the anchoring strength of the tension bars, and meet the lateral strength requirements of the composite concrete pouring.

[0029] Post-tensioned prestressed pipes are arranged between the concrete side walls and the concrete bottom plate. The post-tensioned prestressed pipes are generally metal corrugated pipes. After the composite concrete is poured, metal corrugated pipes are reserved in the beams to pass prestressed steel strands, thereby improving the strength of the composite components, greatly reducing the amount of steel used in the structure, and increasing the seismic resistance of the structure.

[0030] The longitudinal force-bearing reinforcement in the concrete base plate adopts prestressed steel strands, which can reduce the amount of steel used, improve the strength of prefabricated components, and meet the strength requirements of unsupported components during composite concrete pouring.

[0031] The inner formwork is a steel mesh or a thin steel sheet with indentations, which can not only reduce the material consumption of the inner formwork, but also strengthen the connection between the prefabricated components and the composite concrete. The exposed cement slurry of the steel mesh can form a rough contact surface between the new and old concrete.

[0032] Steel bars are laid on the upper part of the concrete bottom plate, so that part of the stress-bearing steel bars are in the prefabricated components and part of the steel bars are in the composite concrete, which reduces the amount of steel bars in the prefabricated components, reduces steel bar conflicts, and facilitates installation. The steel bars laid later are non-prestressed steel bars, which meet the seismic requirements of the components. Linear grooves are reserved on the bottom plate to allow the thick steel bars to be closer to the bottom of the components, and the thickness of the steel bar protective layer is thinner, which reduces the amount of steel used and improves the strength of the components. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the inner formwork of a U-shaped concrete composite beam Figure 1 ; Figure 2 A schematic diagram of the inner formwork of a U-shaped concrete composite beam Figure 2 ; Figure 3 A schematic diagram of the inner formwork of a U-shaped concrete composite beam Figure 3 ; Figure 4 A schematic diagram of the inner formwork of a U-shaped concrete composite beam Figure 4 ; Figure 5 A schematic diagram of the relationship between the reinforcement and the inner formwork of a U-shaped concrete composite beam; Figure 6 A schematic diagram of a U-shaped concrete composite beam Figure 1 ; Figure 7 A schematic diagram of a U-shaped concrete composite beam Figure 2 ; Figure 8 A schematic diagram of a U-shaped concrete composite beam Figure 3 ; Fig. 9 A schematic diagram of a U-shaped concrete composite beam Figure 4 ; Fig.10 A schematic diagram of a U-shaped concrete composite beam Figure 5 ; Fig.11 A schematic diagram of a U-shaped concrete composite beam Figure 6 ; Fig.12 It is a schematic diagram of the AA section of a U-shaped concrete composite beam; Fig.13 A schematic diagram of a U-shaped concrete composite beam Figure 7 ; Fig.14 It is a schematic diagram of the BB section of a U-shaped concrete composite beam; Fig.15 It is a schematic diagram of the cross section of a U-shaped concrete composite beam (with post-tensioning); In the figure: 1. Concrete base plate; 2. Concrete side wall; 2-1. Vertical ribs; 2-2. Outer longitudinal ribs; 2-3. Inner longitudinal ribs; 3. Inner formwork; 3-1. Vertical ribs; 3-2. Horizontal ribs; 4. Tie bars; 5. Longitudinal force-bearing steel bars; 6. Hoop bars; 7. Waist longitudinal steel bars; 8. Steel bars; 9. Post-tensioned prestressed pipe. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1: Please refer to the attached Figure 1-15The present invention provides a technical solution: comprising: a concrete bottom plate, a concrete side wall, an inner mold, a tie bar, a longitudinal force-bearing steel bar and a stirrup. The concrete side wall is arranged on both sides of the concrete bottom plate; the inner mold is arranged on the inner side of the concrete side wall; the tie bar is anchored in the concrete side wall at both ends and arranged along the length direction of the concrete side wall; the longitudinal force-bearing steel bar is buried in the concrete bottom plate and sleeved in the stirrup; the stirrup is partially buried in the concrete side wall or the concrete bottom plate.

[0036] Furthermore, the inner mold piece is permanently placed on the inner side of the concrete side wall, with the bottom edge close to the lower surface of the concrete bottom plate.

[0037] Furthermore, the concrete side walls are provided with waist longitudinal steel bars, and the waist longitudinal steel bars are arranged vertically in the concrete side walls.

[0038] Furthermore, the waist longitudinal steel bars are prestressed steel bars.

[0039] Furthermore, the waist longitudinal reinforcement is located outside the stirrups and is tied together with the stirrups and tension bars.

[0040] Furthermore, the inner mold sheet is a steel mesh sheet or a thin steel sheet with indentations.

[0041] Furthermore, steel bars are laid on the upper portion of the concrete bottom plate.

[0042] Furthermore, a post-tensioned prestressed pipe is arranged between the concrete side wall and the concrete bottom plate.

[0043] Furthermore, the post-tensioned prestressed pipe is in the shape of a curve, a broken line or a straight line.

[0044] Further, the stirrups are welded closed stirrups.

[0045] Furthermore, the thickness of the concrete base plate is 40-300 mm.

[0046] Example 2: It is basically the same as Example 1, except that a small notch is opened at the bottom edge of the inner mold piece, the small notch is slightly larger than the diameter of the stirrup, and the stirrup passes through the small notch. Figure 5 Example 3: It is basically the same as Examples 1 and 2, except that vertical ribs are provided in the concrete side wall. Figure 3 , 10 .

[0047] Furthermore, the inner mold piece has vertical ribs bent longitudinally, corresponding to the vertical ribs.

[0048] Embodiment 4: It is basically the same as Embodiments 1, 2 and 3, except that an outer longitudinal rib is provided on the outer side of the top of the concrete side wall. Figure 2 ,7 .

[0049] Example 5: It is basically the same as Examples 1, 2, and 3, except that an inner longitudinal rib is provided on the inner side of the top of the concrete side wall. Figure 4 , 5 、8.

[0050] Furthermore, the inner mold piece has horizontal ribs bent longitudinally, corresponding to the inner longitudinal ribs.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A U-shaped concrete composite beam, It is characterized in that The invention comprises: a concrete bottom plate (1), a concrete side wall (2), an inner mold plate (3), a tension bar (4), a longitudinal force-bearing steel bar (5) and a stirrup (6). The concrete side wall (2) is arranged on both sides of the concrete bottom plate (1); the inner mold plate (3) is arranged on the inner side of the concrete side wall (2); the tension bar (4) is anchored in the concrete side wall (2) at both ends and arranged along the length direction of the concrete side wall (2); the longitudinal force-bearing steel bar (5) is embedded in the concrete bottom plate (1) and is sleeved in the stirrup (6); and the stirrup (6) is partially embedded in the concrete side wall (2) or the concrete bottom plate (1).

2. A U-shaped concrete composite beam according to claim 1, Features: The inner mold piece (3) is permanently placed on the inner side of the concrete side wall (2), with the bottom edge close to the lower surface of the concrete bottom plate (1).

3. A U-shaped concrete composite beam according to claim 1, Features: The bottom edge of the inner mold piece (3) is provided with a small notch (3-1), the small notch (3-1) is slightly larger than the diameter of the stirrup (6), and the stirrup (6) passes through the small notch (3-1).

4. A U-shaped concrete composite beam according to claim 1, Features: Vertical ribs (2-1) are arranged in the concrete side wall (2).

5. A U-shaped concrete composite beam according to claim 1, Features: The inner mold piece (3) has vertical ribs (3-1) bent longitudinally, corresponding to the vertical ribs (2-1).

6. A U-shaped concrete composite beam according to claim 1, Features: An outer longitudinal rib (2-2) is arranged on the outer side of the top of the concrete side wall (2).

7. A U-shaped concrete composite beam according to claim 1, Features: Inner longitudinal ribs (2-3) are arranged on the inner side of the top of the concrete side wall (2).

8. The U-shaped concrete composite beam according to claim 1, Features: The inner mold piece (3) has a horizontal rib (3-2) bent longitudinally, corresponding to the inner longitudinal rib (2-3).

9. The U-shaped concrete composite beam according to claim 1, Features: The concrete side wall (2) is provided with waist longitudinal steel bars (7), and the waist longitudinal steel bars (7) are arranged vertically on the concrete side wall.

10. A U-shaped concrete composite beam according to claim 9, Features: The waist longitudinal steel bars (7) are prestressed steel bars.

11. A U-shaped concrete composite beam according to claim 9, Features: The waist longitudinal steel bars (7) are located outside the stirrups (6) and are tied together with the stirrups (6) and the tension bars (4).

12. A U-shaped concrete composite beam according to claim 1, Features: A post-tensioned prestressed pipe (9) is provided between the concrete side wall (2) and the concrete bottom plate (1).

13. A U-shaped concrete composite beam according to claim 12, Features: The post-tensioned prestressed pipe (9) is in the shape of a curve, a broken line or a straight line.

14. The U-shaped concrete composite beam according to claim 1, Features: The longitudinal stress-bearing steel bars (5) are prestressed steel strands or non-prestressed steel bars or a combination of prestressed steel bars and non-prestressed steel bars.

15. The U-shaped concrete composite beam according to claim 1, Features: The inner mold sheet (3) is a steel mesh sheet or a thin steel sheet with indentations.

16. A U-shaped concrete composite beam according to claim 1, Features: Steel bars (8) are laid on the upper part of the concrete base plate (1).

17. The U-shaped concrete composite beam according to claim 1, Features: The stirrups (6) are welded closed stirrups.

18. The U-shaped concrete composite beam according to claim 1, Features: The thickness of the concrete base plate (1) is 40-300 mm.

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